linux-kernel - [PATCH][v2] KVM: Remove obsolete comment about locking for kvm_io_bus

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Message-ID: <20250506012251.2613-1-lirongqing@baidu.com>
Date: Tue, 6 May 2025 09:22:51 +0800
From: lirongqing <lirongqing@...du.com>
To: <pbonzini@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <seanjc@...gle.com>
CC: Li RongQing <lirongqing@...du.com>
Subject: [PATCH][v2] KVM: Remove obsolete comment about locking for kvm_io_bus_read/write

From: Li RongQing <lirongqing@...du.com>

Nobody is actually calling these functions with slots_lock held, The
srcu_dereference() in kvm_io_bus_read/write() precisely communicates
both what is being protected, and what provides the protection. so the
comments are no longer needed

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Li RongQing <lirongqing@...du.com>
---
Diff with v1: Remove comments, instead of fixing

 virt/kvm/kvm_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e85b33a..d9fe087 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5774,7 +5774,6 @@ static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
 	return -EOPNOTSUPP;
 }
 
-/* kvm_io_bus_write - called under kvm->slots_lock */
 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
 		     int len, const void *val)
 {
@@ -5795,7 +5794,6 @@ int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
 }
 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
 
-/* kvm_io_bus_write_cookie - called under kvm->slots_lock */
 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
 			    gpa_t addr, int len, const void *val, long cookie)
 {
@@ -5845,7 +5843,6 @@ static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
 	return -EOPNOTSUPP;
 }
 
-/* kvm_io_bus_read - called under kvm->slots_lock */
 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
 		    int len, void *val)
 {
-- 
2.9.4